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formula of calculating rpm of ball grinding mill

The products includes five series: crusher, sand making machine, powder grinding mill, mineral processing equipment and building materials equipment.The "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shells inside surface This is the rotational speed where balls will not fall away from the mills shell Calculation Backup: the formula used for Critical Speed is: N c 766(D-05) whereN c is the .

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